Raymer's ATo

[Sandwich]

Raymer > t1000000
Shak ~ t300000

Daniel Shak raises to $20,000 preflop. Greg Raymer reraises him another $25,000, and Shak reraises another $50,000. Raymer calls. The flop comes 9c-8c-6c, and Shak pushes all-in for another $200,000 and Raymer calls. Raymer shows Ac-10s, while Shak shows K-K. The turn is another club, making a nut flush for Raymer, eliminating Shak and adding another $300,000 to our chip leader's stack.

Comments from some knowledgeable folk? How well did Raymer play this? How well did Shak play it? What would you have done?